I've been reading alot about them. There are some slight differences, like the barrels are NOT interchangeable. Even though they look it and will even slide into each other's recieves. Stock and forearms arent that plentyful but can be found. I was under the impression that is WAS mechanicly an A-5...with slight improvements by C.C. Loomis. I've pretty much decided I'm gonna start the guy at $150...move from there (cause I doubt he'll take it...I don't know how long its been oh his shelf) and make the good ole fashion gut-call.